Passing by object reference to function - C++ Data Type

C++ examples for Data Type:Reference

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Description

Passing by object reference to function

Demo Code

                                              
#include <iostream> 
                                               
class SimpleCat //ww w. j  a  v  a2 s.c o m
{ 
public: 
    SimpleCat();                       // constructor 
    SimpleCat(SimpleCat&);     // copy constructor 
    ~SimpleCat();                      // destructor 
}; 
                                                 
SimpleCat::SimpleCat() 
{ 
    std::cout << "Simple Cat Constructor ..." << std::endl; 
} 
                                                 
SimpleCat::SimpleCat(SimpleCat&) 
{ 
    std::cout << "Simple Cat Copy Constructor ..." << std::endl; 
} 
                                                 
SimpleCat::~SimpleCat() 
{ 
    std::cout << "Simple Cat Destructor ..." << std::endl; 
} 
                                                 
SimpleCat FunctionOne(SimpleCat theCat); 
SimpleCat* FunctionTwo(SimpleCat *theCat); 
                                                 
int main() 
{ 
    std::cout << "Making a cat ..." << std::endl; 
    SimpleCat Frisky; 
    std::cout << "Calling FunctionOne ..." << std::endl; 
    FunctionOne(Frisky); 
    std::cout << "Calling FunctionTwo ..." << std::endl; 
    FunctionTwo(&Frisky); 
    return 0; 
} 
                                                 
// FunctionOne, passes by value 
SimpleCat FunctionOne(SimpleCat theCat) 
{ 
    std::cout << "Function One. Returning ..." << std::endl; 
    return theCat; 
} 
                                                 
// functionTwo, passes by reference 
SimpleCat* FunctionTwo (SimpleCat *theCat) 
{ 
    std::cout << "Function Two. Returning ..." << std::endl; 
    return theCat;  
}

Result


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